SBOS925E December   2020  – October 2024 OPA2391 , OPA391 , OPA4391

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information: OPA391
    5. 5.5 Thermal Information: OPA2391
    6. 5.6 Thermal Information: OPA4391
    7. 5.7 Electrical Characteristics: OPA391DCK and OPA2391YBJ
    8. 5.8 Electrical Characteristics: OPA2391DGK and OPA4391PW
    9. 5.9 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Low Input Bias Current
      2. 6.3.2 Input Differential Voltage
      3. 6.3.3 Capacitive Load Drive
      4. 6.3.4 EMI Rejection
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Three-Terminal CO Gas Sensor
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curve
      2. 7.2.2 4-mA to 20-mA Loop Design
        1. 7.2.2.1 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 PSpice® for TI
        2. 8.1.1.2 TINA-TI™ Simulation Software (Free Download)
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • PW|14
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.2.1.1 Design Requirements

For this example, Figure 7-2 shows an electrical model of a CO sensor is used to simulate the sensor performance. The simulation is designed to model a CO sensor with a sensitivity of 69 nA/ppm. The supply voltage and maximum analog-to-digital converter (ADC) input voltage is 2.5 V, and the maximum concentration is 300 ppm.

OPA391 OPA2391 OPA4391 CO Sensor Simulation Schematic Figure 7-2 CO Sensor Simulation Schematic